In future fusion reactors as well as in intermediate machines, such as ITER or NET, there will bea new dimension when compared with actual machines, and that is the presence of a high radiation field,both ionizing and displacement. This requires the design and development of radiation resistant systemswhich may be operated under radiation. In the case of heating systems the measurements of radiofrequency window materials has been started only recently to be performed under radiation'. Thesemeasurements should be made with special attention due to the perturbation induced by the ionization ofthe filling gases. This effect could also be important in high power heating systems based in pressurizedwaveguides due to the presence of ionizing radiation2. Here the radiation effects on the dielectricproperties of different gases at atmospheric pressure are presented.
"Dielectric losses in gases under ionizing radiation", Proc. SPIE 2104, 18th International Conference on Infrared and Millimeter Waves, 210414 (30 August 1993); doi: 10.1117/12.2298472; https://doi.org/10.1117/12.2298472